1 /* 2 * linux/can/dev.h 3 * 4 * Definitions for the CAN network device driver interface 5 * 6 * Copyright (C) 2006 Andrey Volkov <[email protected]> 7 * Varma Electronics Oy 8 * 9 * Copyright (C) 2008 Wolfgang Grandegger <[email protected]> 10 * 11 */ 12 13 #ifndef _CAN_DEV_H 14 #define _CAN_DEV_H 15 16 #include <linux/can.h> 17 #include <linux/can/netlink.h> 18 #include <linux/can/error.h> 19 #include <linux/can/led.h> 20 21 /* 22 * CAN mode 23 */ 24 enum can_mode { 25 CAN_MODE_STOP = 0, 26 CAN_MODE_START, 27 CAN_MODE_SLEEP 28 }; 29 30 /* 31 * CAN common private data 32 */ 33 struct can_priv { 34 struct can_device_stats can_stats; 35 36 struct can_bittiming bittiming, data_bittiming; 37 const struct can_bittiming_const *bittiming_const, 38 *data_bittiming_const; 39 struct can_clock clock; 40 41 enum can_state state; 42 u32 ctrlmode; 43 u32 ctrlmode_supported; 44 45 int restart_ms; 46 struct timer_list restart_timer; 47 48 int (*do_set_bittiming)(struct net_device *dev); 49 int (*do_set_data_bittiming)(struct net_device *dev); 50 int (*do_set_mode)(struct net_device *dev, enum can_mode mode); 51 int (*do_get_state)(const struct net_device *dev, 52 enum can_state *state); 53 int (*do_get_berr_counter)(const struct net_device *dev, 54 struct can_berr_counter *bec); 55 56 unsigned int echo_skb_max; 57 struct sk_buff **echo_skb; 58 59 #ifdef CONFIG_CAN_LEDS 60 struct led_trigger *tx_led_trig; 61 char tx_led_trig_name[CAN_LED_NAME_SZ]; 62 struct led_trigger *rx_led_trig; 63 char rx_led_trig_name[CAN_LED_NAME_SZ]; 64 struct led_trigger *rxtx_led_trig; 65 char rxtx_led_trig_name[CAN_LED_NAME_SZ]; 66 #endif 67 }; 68 69 /* 70 * get_can_dlc(value) - helper macro to cast a given data length code (dlc) 71 * to __u8 and ensure the dlc value to be max. 8 bytes. 72 * 73 * To be used in the CAN netdriver receive path to ensure conformance with 74 * ISO 11898-1 Chapter 8.4.2.3 (DLC field) 75 */ 76 #define get_can_dlc(i) (min_t(__u8, (i), CAN_MAX_DLC)) 77 #define get_canfd_dlc(i) (min_t(__u8, (i), CANFD_MAX_DLC)) 78 79 /* Drop a given socketbuffer if it does not contain a valid CAN frame. */ 80 static inline int can_dropped_invalid_skb(struct net_device *dev, 81 struct sk_buff *skb) 82 { 83 const struct canfd_frame *cfd = (struct canfd_frame *)skb->data; 84 85 if (skb->protocol == htons(ETH_P_CAN)) { 86 if (unlikely(skb->len != CAN_MTU || 87 cfd->len > CAN_MAX_DLEN)) 88 goto inval_skb; 89 } else if (skb->protocol == htons(ETH_P_CANFD)) { 90 if (unlikely(skb->len != CANFD_MTU || 91 cfd->len > CANFD_MAX_DLEN)) 92 goto inval_skb; 93 } else 94 goto inval_skb; 95 96 return 0; 97 98 inval_skb: 99 kfree_skb(skb); 100 dev->stats.tx_dropped++; 101 return 1; 102 } 103 104 static inline bool can_is_canfd_skb(const struct sk_buff *skb) 105 { 106 /* the CAN specific type of skb is identified by its data length */ 107 return skb->len == CANFD_MTU; 108 } 109 110 /* get data length from can_dlc with sanitized can_dlc */ 111 u8 can_dlc2len(u8 can_dlc); 112 113 /* map the sanitized data length to an appropriate data length code */ 114 u8 can_len2dlc(u8 len); 115 116 struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max); 117 void free_candev(struct net_device *dev); 118 119 /* a candev safe wrapper around netdev_priv */ 120 struct can_priv *safe_candev_priv(struct net_device *dev); 121 122 int open_candev(struct net_device *dev); 123 void close_candev(struct net_device *dev); 124 int can_change_mtu(struct net_device *dev, int new_mtu); 125 126 int register_candev(struct net_device *dev); 127 void unregister_candev(struct net_device *dev); 128 129 int can_restart_now(struct net_device *dev); 130 void can_bus_off(struct net_device *dev); 131 132 void can_change_state(struct net_device *dev, struct can_frame *cf, 133 enum can_state tx_state, enum can_state rx_state); 134 135 void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, 136 unsigned int idx); 137 unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx); 138 void can_free_echo_skb(struct net_device *dev, unsigned int idx); 139 140 struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf); 141 struct sk_buff *alloc_canfd_skb(struct net_device *dev, 142 struct canfd_frame **cfd); 143 struct sk_buff *alloc_can_err_skb(struct net_device *dev, 144 struct can_frame **cf); 145 146 #endif /* !_CAN_DEV_H */ 147